Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: C1.00149 : High resolution scanning tunneling microscope (STM) image of SrTiO$_3$(100)-$\sqrt{5}\times\sqrt{5}-R26.6^\circ$ surface
Author:
SrTiO$_3$(100)-$\sqrt{5}\times\sqrt{5}-R26.6^\circ$ surfaces were
studied by scanning tunneling microscope (STM) in ultra-high
vacuum conditions at room temperatures. STM images with truly
atomic resolution in filled states, which have never been
reported, were successfully obtained. The atomic arrangement in
$\sqrt{5}\times\sqrt{5}$ unit cell is clearly seen. It is
currently assumed that Ti and its fourfold site O atoms were
separately imaged with varying bias voltages, which indicates
that TiO$_2$ plane is a basic plane of $\sqrt{5}\times\sqrt{5}$
surface superstructures. The dI/dV images simultaneously taken
with topographic images were also obtained in filled states.
Comparing our experimental results with the previous works,
especially a theoretical study of O-vacancy model [1] and an
experimental and theoretical study of Sr adatom model [2],
possible structures on $\sqrt{5}\times\sqrt{5}$ surfaces will be
discussed.\\[4pt]
[1] Z. Fang and K Terakura, Surf. Sci. 470, L75(2000)\\[0pt]
[2] T. Kubo and H. Nozoye, Phys. Rev. Lett. 86, 1801(2001)
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.C1.149
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